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Creating polygons that share the boundaries of existing polygons

How to dissolve polygons that have been split back into their original polygons?Need to enhance a function for creating quadrants within polygonshow to find that two polygon boundaries are connected?Convert SpatialPolygonsDF boundaries to SpatialLinesDF keeping information on polygonsQGIS Topological editing error - the new polygon overwrite the existing one after saving layer editsQGIS Creating 4km point grid within polygonsGiven two polygons, find the the one with more detailed/accurate shoreline?QGIS create boundaries from background imageQGIS coordinates lost creating polygonsPrevent user from creating self intersected polygons

1

I'm creating polygon (that about actual vegetation).

First, I create one polygon

After that, I will create more polygons that share the boundaries of existing polygon.
But, it show result like below image.

How can I create polygons that share the boundaries of existing polygons.

And last, can I use trace method for creating polygon in QGIS?

qgis polygon trace create

share|improve this question

edited Mar 20 at 10:19

Vince

14.8k32749

asked Mar 20 at 10:16

Jung TaeJunJung TaeJun

391

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Which version of QGIS are you using?
  
  – Erik
  Mar 20 at 10:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  2.18.17 version
  
  – Jung TaeJun
  Mar 20 at 11:01
  

  
  
  
  

add a comment | 

1

I'm creating polygon (that about actual vegetation).

First, I create one polygon

After that, I will create more polygons that share the boundaries of existing polygon.
But, it show result like below image.

How can I create polygons that share the boundaries of existing polygons.

And last, can I use trace method for creating polygon in QGIS?

qgis polygon trace create

share|improve this question

edited Mar 20 at 10:19

Vince

14.8k32749

asked Mar 20 at 10:16

Jung TaeJunJung TaeJun

391

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Which version of QGIS are you using?
  
  – Erik
  Mar 20 at 10:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  2.18.17 version
  
  – Jung TaeJun
  Mar 20 at 11:01
  

  
  
  
  

add a comment | 

I'm creating polygon (that about actual vegetation).

First, I create one polygon

After that, I will create more polygons that share the boundaries of existing polygon.
But, it show result like below image.

How can I create polygons that share the boundaries of existing polygons.

And last, can I use trace method for creating polygon in QGIS?

qgis polygon trace create

share|improve this question

edited Mar 20 at 10:19

Vince

14.8k32749

asked Mar 20 at 10:16

Jung TaeJunJung TaeJun

391

share|improve this question

edited Mar 20 at 10:19

Vince

14.8k32749

asked Mar 20 at 10:16

Jung TaeJunJung TaeJun

391

share|improve this question

edited Mar 20 at 10:19

Vince

14.8k32749

asked Mar 20 at 10:16

Jung TaeJunJung TaeJun

391

edited Mar 20 at 10:19

Vince

14.8k32749

edited Mar 20 at 10:19

Vince

14.8k32749

asked Mar 20 at 10:16

Jung TaeJunJung TaeJun

391

asked Mar 20 at 10:16

Jung TaeJunJung TaeJun

391

3 Answers
3

active

oldest

votes

2

In QGis 3.x

1. Enable the snapping toolbar and open snapping settings. Then, choose the advanced configuration and select your layer of interest
   


2. Go to Add Feature and start digitizing. When you will be close to a vertex, you should see a particular color


3. When you are done, I suggest you to check the topology
   

share|improve this answer

answered Mar 20 at 11:11

Yannick DOUNGMOYannick DOUNGMO

178110

add a comment | 

1

To create polygons that shares boundaries with existing ones,

In QGis 2.x

1. Settings > snapping options > choose advanced and select your layer.
   Then define the snapping mode, the tolerance and your units
   




2. Go to Add Feature and start digitizing. When you will be close to a vertex, you should see a particular color



3. When you are done, I suggest you to check the topology


4. As the trace method, you may see Freehand Editing useful

share|improve this answer

answered Mar 20 at 11:02

Yannick DOUNGMOYannick DOUNGMO

178110

add a comment | 

0

This digitising method might help:

1. Set Avoid Intersections ON as mentioned above.


2. Start digitising at a shared vertex or segment – digitise vertices that are not shared


3. Continue digitising


4. When you reach the last non-shared vertex – digitise a shared vertex


5. Then to finish digitise a last point – but make sure that it is located in a place that ensures the polygon extends over all shared vertices – right click to finish digitsing the polygon.
   

QGIS will create all the vertices for the new polygon as shown below
[

share|improve this answer

answered Mar 20 at 11:22

AquamarineAquamarine

1757

add a comment | 

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2

In QGis 3.x

1. Enable the snapping toolbar and open snapping settings. Then, choose the advanced configuration and select your layer of interest
   


2. Go to Add Feature and start digitizing. When you will be close to a vertex, you should see a particular color


3. When you are done, I suggest you to check the topology
   

share|improve this answer

answered Mar 20 at 11:11

Yannick DOUNGMOYannick DOUNGMO

178110

add a comment | 

2

In QGis 3.x

1. Enable the snapping toolbar and open snapping settings. Then, choose the advanced configuration and select your layer of interest
   


2. Go to Add Feature and start digitizing. When you will be close to a vertex, you should see a particular color


3. When you are done, I suggest you to check the topology
   

share|improve this answer

answered Mar 20 at 11:11

Yannick DOUNGMOYannick DOUNGMO

178110

add a comment | 

In QGis 3.x

1. Enable the snapping toolbar and open snapping settings. Then, choose the advanced configuration and select your layer of interest
   


2. Go to Add Feature and start digitizing. When you will be close to a vertex, you should see a particular color


3. When you are done, I suggest you to check the topology
   

share|improve this answer

answered Mar 20 at 11:11

Yannick DOUNGMOYannick DOUNGMO

178110

share|improve this answer

answered Mar 20 at 11:11

Yannick DOUNGMOYannick DOUNGMO

178110

answered Mar 20 at 11:11

Yannick DOUNGMOYannick DOUNGMO

178110

answered Mar 20 at 11:11

Yannick DOUNGMOYannick DOUNGMO

178110

1

To create polygons that shares boundaries with existing ones,

In QGis 2.x

1. Settings > snapping options > choose advanced and select your layer.
   Then define the snapping mode, the tolerance and your units
   




2. Go to Add Feature and start digitizing. When you will be close to a vertex, you should see a particular color



3. When you are done, I suggest you to check the topology


4. As the trace method, you may see Freehand Editing useful

share|improve this answer

answered Mar 20 at 11:02

Yannick DOUNGMOYannick DOUNGMO

178110

add a comment | 

1

To create polygons that shares boundaries with existing ones,

In QGis 2.x

1. Settings > snapping options > choose advanced and select your layer.
   Then define the snapping mode, the tolerance and your units
   




2. Go to Add Feature and start digitizing. When you will be close to a vertex, you should see a particular color



3. When you are done, I suggest you to check the topology


4. As the trace method, you may see Freehand Editing useful

share|improve this answer

answered Mar 20 at 11:02

Yannick DOUNGMOYannick DOUNGMO

178110

add a comment | 

To create polygons that shares boundaries with existing ones,

In QGis 2.x

1. Settings > snapping options > choose advanced and select your layer.
   Then define the snapping mode, the tolerance and your units
   




2. Go to Add Feature and start digitizing. When you will be close to a vertex, you should see a particular color



3. When you are done, I suggest you to check the topology


4. As the trace method, you may see Freehand Editing useful

share|improve this answer

answered Mar 20 at 11:02

Yannick DOUNGMOYannick DOUNGMO

178110

share|improve this answer

answered Mar 20 at 11:02

Yannick DOUNGMOYannick DOUNGMO

178110

answered Mar 20 at 11:02

Yannick DOUNGMOYannick DOUNGMO

178110

answered Mar 20 at 11:02

Yannick DOUNGMOYannick DOUNGMO

178110

0

This digitising method might help:

1. Set Avoid Intersections ON as mentioned above.


2. Start digitising at a shared vertex or segment – digitise vertices that are not shared


3. Continue digitising


4. When you reach the last non-shared vertex – digitise a shared vertex


5. Then to finish digitise a last point – but make sure that it is located in a place that ensures the polygon extends over all shared vertices – right click to finish digitsing the polygon.
   

QGIS will create all the vertices for the new polygon as shown below
[

share|improve this answer

answered Mar 20 at 11:22

AquamarineAquamarine

1757

add a comment | 

0

This digitising method might help:

1. Set Avoid Intersections ON as mentioned above.


2. Start digitising at a shared vertex or segment – digitise vertices that are not shared


3. Continue digitising


4. When you reach the last non-shared vertex – digitise a shared vertex


5. Then to finish digitise a last point – but make sure that it is located in a place that ensures the polygon extends over all shared vertices – right click to finish digitsing the polygon.
   

QGIS will create all the vertices for the new polygon as shown below
[

share|improve this answer

answered Mar 20 at 11:22

AquamarineAquamarine

1757

add a comment | 

This digitising method might help:

1. Set Avoid Intersections ON as mentioned above.


2. Start digitising at a shared vertex or segment – digitise vertices that are not shared


3. Continue digitising


4. When you reach the last non-shared vertex – digitise a shared vertex


5. Then to finish digitise a last point – but make sure that it is located in a place that ensures the polygon extends over all shared vertices – right click to finish digitsing the polygon.
   

QGIS will create all the vertices for the new polygon as shown below
[

share|improve this answer

answered Mar 20 at 11:22

AquamarineAquamarine

1757

share|improve this answer

answered Mar 20 at 11:22

AquamarineAquamarine

1757

answered Mar 20 at 11:22

AquamarineAquamarine

1757

answered Mar 20 at 11:22

AquamarineAquamarine

1757